Malicious PDF — malware analysis report

Static analysis result for SHA-256 131de52fc41970aa…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 10:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 203151e6d0bb6b87a3249326f4142cb9 SHA-1: 9c145b8d97d5243d939e412359ee1ad68686a93d SHA-256: 131de52fc41970aac24440b742cbd9e799b5978fde270b0dd34be1de3fafc421
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to potentially compromised websites and impersonating cloud document services to encourage downloads. The presence of embedded URLs and the 'Password-protected archive handoff' heuristic strongly indicate that the document is designed to trick users into downloading and decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=apk+solid+explorer PDF link annotation
    • http://canavesiobruno-architetti.it/userfiles/files/85564032584.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/surelivisuvuk.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dceef751d8---bisixiposizefunakulinesi.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/74880006983.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/finebomuzopegumuwogul.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210905_213753.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xurikowoxolevoza.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/64332507149.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xodaparufoweteso.pdfIn PDF document text
    • http://chapelguild.com/images/usr/40325047902.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/1936966198.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/kirapokitekop.pdfIn PDF document text
    • https://arendic.cl/files/nijigekozeliloterireseki.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/1683774932.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/muvalububaderezovevanizaw.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136a1ab87c86---jiripopunug.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d286f2161---58937046723.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/jarekorapelotepusigobuso.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/lisiterefiposaz.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/21256859533.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/pejifanopubi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 17976 bytes
SHA-256: 1ee3e36f3e6eae868eb55856ec0d884da349afbb7dbeb02b4d92abe035ccb354
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10196 bytes
SHA-256: 2dead33405b8f5abbc416bc0d6cc62037c7f3eea2b5f4d7a8ae1d1bdb7da83ed

Open this report in the interactive analyzer, or submit your own file for analysis.